import Vue from 'vue'
import axios from 'axios'
import { Message, MessageBox } from 'element-ui'
import store from '@/store'
import { getToken } from '@/utils/auth'
import Qs from 'qs'

// create an axios instance
const service = axios.create({
  baseURL: process.env.BASE_API, // api的base_url
  timeout: 5000, // request timeout
  headers: { 'Content-Type': 'application/x-www-form-urlencoded' }, // 只有post才设置
  transformRequest: [function(data) {
    // Do whatever you want to transform the data
    /* let ret = ''
     for (let it in data) {
     ret += encodeURIComponent(it) + '=' + encodeURIComponent(data[it]) + '&'
     }
     return ret */
    return Qs.stringify(data, { arrayFormat: 'indices' })
  }]
})

// request interceptor
service.interceptors.request.use(config => {
  // Do something before request is sent
  if (store.getters.token) {
    const token = getToken()
    if (config.method === 'get') {
      config.params = config.params || {}
      config.params['token'] = token
    } else {
      config.data = config.data || {}
      config.data['token'] = token
    }
    // config.headers['X-Token'] = getToken() // 让每个请求携带token-- ['X-Token']为自定义key 请根据实际情况自行修改
  }
  return config
}, error => {
  // Do something with request error
  console.log(error) // for debug
  Promise.reject(error)
})

// respone interceptor
service.interceptors.response.use(
  response => {
    /**
     * 下面的注释为通过response自定义code来标示请求状态，当code返回如下情况为权限有问题，登出并返回到登录页
     * 如通过xmlhttprequest 状态码标识 逻辑可写在下面error中
     */
    const res = response.data
    if (res.code > 100) {
      // 401:Token 过期了;
      if (res.code === 401) {
        MessageBox.confirm('你已被登出，可以取消继续留在该页面，或者重新登录', '确定登出', {
          confirmButtonText: '重新登录',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(() => {
          store.dispatch('FedLogOut').then(() => {
            location.reload()
          })
        })
      }
      Message({
        message: res.message,
        type: 'error',
        duration: 5 * 1000
      })
      return Promise.reject(res)
    } else if (res.code !== undefined) {
      return res.data
    } else {
      return res
    }
  },
  error => {
    console.log('err' + error)// for debug
    Message({
      message: error.message,
      type: 'error',
      duration: 5 * 1000
    })
    return Promise.reject(error)
  })

// 安装到全局
function plugin(Vue, axios, http) {
  if (plugin.installed) {
    return
  }
  plugin.installed = true

  if (!axios) {
    console.error('You have to install axios')
    return
  }
  if (!http) {
    console.error('You have to create axios instance')
    return
  }

  Vue.axios = axios

  Object.defineProperties(Vue.prototype, {
    axios: {
      get() {
        return axios
      }
    },

    $http: {
      get() {
        return http
      }
    }

  })
}
Vue.use(plugin, axios, service)

export default service
